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Author Topic: cylinder head washer  (Read 956 times)

Offline JJH

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cylinder head washer
« on: March 10, 2017, 09:25:04 AM »
1979 BMW R65
Hi guys, one of the washers that is required to attach the cylinder head to the cylinder has left.  I looked for it, I asked nicely for it to come home.  I did the sweep the garage with a magnet, no luck.  Unfortunately BMW wants $4.55 for the washer.  Normally this would not be a problem since Zn steel washers are easily available.  But the washer is 3.5 mm thick.  I can't find them at Grainger, McMaster-Carr or the local hardware store.  I can find the right size in about 2 mm thick (or less).  Can I double up?  Or is this a time when only BMW will do.  Also if you happen to find my washer, please tell it to come home.

Thanks,

John
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Offline Matt Chapter

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Re: cylinder head washer
« Reply #1 on: March 10, 2017, 11:13:03 AM »
Quote
attach the cylinder head to the cylinder

For clarification, this is the relevant fiche and part number:
http://www.maxbmwmotorcycles.com/fiche/DiagramsMid/B0000044.png?v=12082016 item number 5.  BMW part number  11 12 1 336 872.

My thinking is that the washer height affects how tightly the nut holds the head against the gasket.  Height in this case is probably critical for achieving a good seal with the correct torque values.  5 bucks, take it out of your beer budget, that'll larn ya!
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Offline Barry

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Re: cylinder head washer
« Reply #2 on: March 10, 2017, 11:40:40 AM »
$4.55 for a washer seems excessive. Other than the fact it's a strong washer I can't see how it would be special.  It's not as if the torque value is that high.  I checked the BMW workshop manual and they don't even get a mention.

The washer will come home but only after you have bought a new one.
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Barry Cheshire, England 79 R45

Offline Bob_Roller

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Re: cylinder head washer
« Reply #3 on: March 11, 2017, 04:19:48 PM »
You can use two thin washers, just make sure they are steel or stainless steel .

A general rule in aviation, is that you need to have one complete thread protruding beyond the nut .

Also there is a right way to install a washer, look at a thick washer from the edge, one edge will be rounded and one will be sharp, the rounded edge goes against what you are bolting together .
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Offline JJH

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Re: cylinder head washer
« Reply #4 on: March 13, 2017, 02:56:19 PM »
Thanks for all the advice.  Bob would it be the best idea to have the same washers on both sides or does that matter.  Or should I/ can I keep the BMW washer on one side and the double washers on the other.  Also do you know why they would use thick washers in the first place?
Thanks,

John
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Offline skippyc

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Re: cylinder head washer
« Reply #5 on: March 13, 2017, 05:48:58 PM »
I know they use thick washers on my BSA to stop the washer dishing and pulling into the head
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